This program is available directly from the vendor.
Vendor's antivirus software homepage:

Pros - Panda Anti-Virus:
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Excellent virus detection record
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Daily virus signature updates
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Flexible, easy to use, - both for beginners and experts
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The only program which scans web surfing, ftp, newsgroup
and AOL email attachments
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The only program which integrates your mail folders into
the antivirus interface
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Support for all common archive formats
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Very fast scanner, low system impact
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DOS scanner included
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Very stable except on ME
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One of the least expensive
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Now online registration available
Cons - Panda Anti-Virus:
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Log file could be more informative
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Some have reported stability issues on Windows ME, might
fail to scan all files during heavy load on this OS
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Vendors website is badly designed (just my personal
opinion:).
Major flaws - Panda Anti-Virus:
Email clients supported - Panda Anti-Virus:
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Outlook
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Outlook Express
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Netscape Messenger
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Eudora
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Pegasus Mail
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MSN Mail
Also supports:
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HTTP: Internet Explorer, Netscape, Opera
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FTP: WS_FTP, CuteFTP
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NNTP: Outlook Express, Netscape Messenger, Free Agent